Carl walther



' threads.

UNITED STATES PATENT OFFICE.

CART WALTHER, 0F CHEMNITZ, GERMAJ N'Y, ASSIGNOR TO THE FIRM OF SCHUIBERT SALZER MASGHINENFABRIK AKTIENGESELI SCHAFT, 0F CHE-MNITZ, GERMANY.

THREAD-TIGHTENER OF WARP-LOOMS.

Specification of Letters Patent.

Patented Oct. 14, 1919.

Application filed October 26, 1916. Serial No. 127,742.

To all whom it may concern Be it known that I, CARL'WALTHER, a citizen of Germany, and residing at Chemnitz, in the German Empire, have invented new and useful Improvements in Thread- Tighteners of Warp-Looms, of which the following is a specification.

This invention relatesv to devices in warp looms for in'lparting the proper tension to' the warp threads and is especially designed for warp looms in which a separate warp is supplied to the front series of guide needles as well as to the rear series of guide needles. I

Hitherto, both of these warps were wound upon separate warp beams and from these separately mounted warp beams the warp threads were fed to the respective guide needles over separate thread tighteners. Both tighteners had to be'very accurately adjusted in order to insure an entirely uniform thread feeding of the warps, which is a requisite for the production of a really good .fabric. Not only does any variation in the tension of the threads render the fabric Streaky, but considerable losses of single beam and feeding the threads to the' needles over separate tighteners. With this arrangement it still remains a difficult thing to adjust both tighteners to conform so that the same will produce an equal feed of, and a uniform tension in, the thread.

The drawback of an unequal consumption of warp threads can be overcomeby the application of a single warp beam. However, then there is afstill-greater necessity of obtaining an equal tension on the If variations occur in the tension of the threads, andthe tension of one thread system p-reponderates, this part ofthe warp would be drawn off and the other part would naturally be taken along with the tensioned part; it is to beanticipated that the threads of this latter part will lie too loosely in the fabric produced.

Hence it is difficult to produce a satisfactorily uniform fabric by the means and expedients hitherto proposed.

It is the object of my present invention to provide means which will enable the removal of all of these drawbacks. ject I attain by placing both warps upon a single warp beam and mounting both thread tighteners upon a common tightening lever; thereby, any variation in the tension of the threads is equally distributed upon both warps.

The figure shows an embodiment of my present invention by way of example.

In the embodiment of my present invention, as illustrated diagrammatically in the drawings, the warps 4 and 5 which are to supply the threads for the needles on the thread bars 8 and 11 respectively, are wound upon a common warp beam 2 supported in bearings of the machine frame 1 in a manner well known. A depending lever 12 is fulcrumed on the machine frame and provided with two arms 13 and 14 which carry at their ends transversely disposed thread tightening rods 15 and 16 respectively. The threads of the warp 4 are passed over the thread tightener 15 while the threads of the warp 5 pass over the thread tightener 16. The said lever is subject to the action of a single helical spring 6, which is hooked with one end to the extreme of the arm 13,

and which is connected with its opposite .both warps.

Since the threads of the two warps are led to the two thread bars from different directions, the thread tightening rods 15 and 16 must be disposed so that a uniform feed with threads having equal tensions can be obtained. The threads of the warp 4, in passing over the tensioning rod 15, form an angle a which is larger than the angle 1) formed by the warp threads passing over the tensioning rod 16. Now, it becomes obvious from the drawing that the larger the angle is which the thread forms, the shorter is the path of contact between the thread and the tensioning rod Over which the thread This ob- 1 respect. The required compensation I obtain by giving the arms 13 and 1 1 supporting the tensioning rods 15 and 16 at their respective ends, a different leverage.

The lever length of the arm 13 supporting the tensioning rod 15 exceeds the lever length of the arm 14 for the tensioning rod 16. Both of the said tensioning rods, how ever, swing with a common lever 12, hence, both must necessarily participate in the same movement.- The leverage of the longer arm carrying the tightening rod that affords the smaller frictional contact with the threads is larger than the leverage of the shorter arm 14 carrying the tightening rod having the larger frictional contact with the threads. In this manner, the difference in the drawing force exerted upon the two threads is compensated for, which difference is caused by the difference in the angular guide way for the threads. The smaller friction produced within the larger angle a and multiplied by the larger leverage yields the same momentum as the larger friction that is produced within the smaller angle 6 and multi plied by the smaller leverage.

Any variation in the tension is equally distributed upon both tightening rods through the spring 6 common to both. The possibility of any difference of tension in the threads is effectually removed through my invention.

The scope and utility of my invention is not restricted to the particular form of the device I have illustrated in the drawings;

modifications may be made in various respects without thereby involving any departure from the essence of my invention which I have set forth hereinbefore.

What I claim as my invention and desire to secure byLetters Patent of the United States, is

1. In a warp loom, the combination of a single warp beam adapted to supply two warps simultaneously, two guide needle bars and guide needles thereon; with a single oscillatory mounted member, an extension on said member, a thread tightener on said extension, a second extension on said member, a thread tightener on said second extension, said latter thread tightener having a leverage different from the leverage of the firstnamed thread tightener, and an adjustable spring connected to said member to exert a thread tightening action upon the thread tighteners on said member, whereby the threadtightening action of said tighteners may be simultaneously regulated.

2. In a warp loom, the combination of a single warp beam adapted to supply two warps simultaneously, two guide needle bars and guide needles thereon; with a single oscillatory mounted member, an arm on said member, a thread tightener on said arm, a second arm on said member and eX- tending in another direction than said first named arm, a thread tightener on said second arm, said latter thread tightener hav ing a leverage different from the leverage of said first named thread tightener, and an adjustable spring connected to said member so as to exert a thread tightening action upon said thread tighteners on said member, whereby the tightening action of said thread tighteners may be regulated.

3. In a warp loom, the combination of a single warp beam adapted to supply a pair of warps, a pair of guide needle bars and guide needles thereon; with a single oscillatory mounted member pivotally mounted at one end, a pair of thread tighteners on said member at different distances from said end, the said thread tighteners being so located on said member as to have different leverages, and a spring adapted to act upon said member.

In testimony whereof I have hereunto affixed my signature.

CARL WALTHE-R. 

